diff --git a/packages/squiggle-lang/__tests__/GenericDist/GenericDistSparkline_Test.res b/packages/squiggle-lang/__tests__/GenericDist/GenericDistSparkline_Test.res
index 8b3a8542..d2117936 100644
--- a/packages/squiggle-lang/__tests__/GenericDist/GenericDistSparkline_Test.res
+++ b/packages/squiggle-lang/__tests__/GenericDist/GenericDistSparkline_Test.res
@@ -1,17 +1,11 @@
 open Jest
 open Expect
 
-let normalDist: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 5.0, stdev: 2.0}))
-let uniformDist: GenericDist_Types.genericDist = Symbolic(#Uniform({low: 9.0, high: 10.0}))
-let betaDist: GenericDist_Types.genericDist = Symbolic(#Beta({alpha: 2.0, beta: 5.0}))
-let lognormalDist: GenericDist_Types.genericDist = Symbolic(#Lognormal({mu: 0.0, sigma: 1.0}))
-let cauchyDist: GenericDist_Types.genericDist = Symbolic(#Cauchy({local: 1.0, scale: 1.0}))
-let triangularDist: GenericDist_Types.genericDist = Symbolic(#Triangular({low: 1.0, medium: 2.0, high: 3.0}))
-let exponentialDist: GenericDist_Types.genericDist = Symbolic(#Exponential({rate: 2.0}))
+let {normalDist, uniformDist, betaDist, lognormalDist, cauchyDist, triangularDist, exponentialDist} = module(GenericDist_Fixtures)
 
 let runTest = (name: string, dist : GenericDist_Types.genericDist, expected: string) => {
   test(name, () => {
-    let result = GenericDist.toSparkline(~xyPointLength=100, ~sampleCount=100, ~buckets=20, dist)
+    let result = GenericDist.toSparkline(~sampleCount=100, ~buckets=20, dist)
     switch result {
     | Ok(sparkline) => expect(sparkline)->toEqual(expected)
     | Error(err) => expect("Error")->toEqual(expected)
@@ -20,11 +14,11 @@ let runTest = (name: string, dist : GenericDist_Types.genericDist, expected: str
 }
 
 describe("sparkline of generic distribution", () => {
-  runTest("normal", normalDist, `▁▁▁▁▂▃▄▆▇██▇▆▄▃▂▁▁▁`)
-  runTest("uniform", uniformDist, `████████████████████`)
-  runTest("beta", uniformDist, `████████████████████`)
-  runTest("lognormal", lognormalDist, `█▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁`)
-  runTest("cauchy", cauchyDist, `▁▁▁▁▁▁▁▁▁██▁▁▁▁▁▁▁▁▁`)
-  runTest("triangular", triangularDist, `▁▂▃▄▄▅▆▇████▇▆▅▄▄▃▂▁`)
-  runTest("exponential", exponentialDist, `█▆▄▃▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁`)
+  runTest("normal", normalDist, `▁▃▄▅▆▇████████▇▆▅▄▃▁`)
+  runTest("uniform", uniformDist, `▁██▁`)
+  runTest("beta", betaDist, `▁▅▇█████████▇▇▆▅▄▃▂▁`)
+  runTest("lognormal", lognormalDist, `▁▇████▇▇▆▆▅▄▄▃▃▂▂▁▁▁`)
+  runTest("cauchy", cauchyDist, `▁▁▁▂▄▅▆▇████▇▆▅▄▂▁▁▁`)
+  runTest("triangular", triangularDist, `▁▃▄▅▆▆▇██████▇▆▆▅▄▃▁`)
+  runTest("exponential", exponentialDist, `███▇▇▆▆▆▅▅▄▄▃▃▃▂▂▁▁▁`)
 })
diff --git a/packages/squiggle-lang/__tests__/GenericDist/GenericDist_Fixtures.res b/packages/squiggle-lang/__tests__/GenericDist/GenericDist_Fixtures.res
new file mode 100644
index 00000000..05f0981b
--- /dev/null
+++ b/packages/squiggle-lang/__tests__/GenericDist/GenericDist_Fixtures.res
@@ -0,0 +1,11 @@
+let normalDist5: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 5.0, stdev: 2.0}))
+let normalDist10: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 10.0, stdev: 2.0}))
+let normalDist20: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 20.0, stdev: 2.0}))
+let normalDist: GenericDist_Types.genericDist = normalDist5
+
+let betaDist: GenericDist_Types.genericDist = Symbolic(#Beta({alpha: 2.0, beta: 5.0}))
+let lognormalDist: GenericDist_Types.genericDist = Symbolic(#Lognormal({mu: 0.0, sigma: 1.0}))
+let cauchyDist: GenericDist_Types.genericDist = Symbolic(#Cauchy({local: 1.0, scale: 1.0}))
+let triangularDist: GenericDist_Types.genericDist = Symbolic(#Triangular({low: 1.0, medium: 2.0, high: 3.0}))
+let exponentialDist: GenericDist_Types.genericDist = Symbolic(#Exponential({rate: 2.0}))
+let uniformDist: GenericDist_Types.genericDist = Symbolic(#Uniform({low: 9.0, high: 10.0}))
diff --git a/packages/squiggle-lang/__tests__/GenericDist/GenericOperation__Test.res b/packages/squiggle-lang/__tests__/GenericDist/GenericOperation__Test.res
index dc456865..c936e0bd 100644
--- a/packages/squiggle-lang/__tests__/GenericDist/GenericOperation__Test.res
+++ b/packages/squiggle-lang/__tests__/GenericDist/GenericOperation__Test.res
@@ -6,11 +6,8 @@ let env: DistributionOperation.env = {
   xyPointLength: 100,
 }
 
-let normalDist5: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 5.0, stdev: 2.0}))
-let normalDist10: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 10.0, stdev: 2.0}))
-let normalDist20: GenericDist_Types.genericDist = Symbolic(#Normal({mean: 20.0, stdev: 2.0}))
-let uniformDist: GenericDist_Types.genericDist = Symbolic(#Uniform({low: 9.0, high: 10.0}))
 
+let {normalDist5, normalDist10, normalDist20, uniformDist} = module(GenericDist_Fixtures)
 let {toFloat, toDist, toString, toError} = module(DistributionOperation.Output)
 let {run} = module(DistributionOperation)
 let {fmap} = module(DistributionOperation.Output)
diff --git a/packages/squiggle-lang/__tests__/Reducer/Reducer_TestHelpers.res b/packages/squiggle-lang/__tests__/Reducer/Reducer_TestHelpers.res
index 7029e2ff..65f689cc 100644
--- a/packages/squiggle-lang/__tests__/Reducer/Reducer_TestHelpers.res
+++ b/packages/squiggle-lang/__tests__/Reducer/Reducer_TestHelpers.res
@@ -9,6 +9,3 @@ let expectParseToBe = (expr: string, answer: string) =>
 
 let expectEvalToBe = (expr: string, answer: string) =>
   Reducer.eval(expr)->ExpressionValue.toStringResult->expect->toBe(answer)
-
-// Current configuration does not ignore this file so we have to have a test
-test("test helpers", () => expect(1)->toBe(1))
diff --git a/packages/squiggle-lang/__tests__/Symbolic_test.res b/packages/squiggle-lang/__tests__/Symbolic_test.res
index eb953743..058a5528 100644
--- a/packages/squiggle-lang/__tests__/Symbolic_test.res
+++ b/packages/squiggle-lang/__tests__/Symbolic_test.res
@@ -22,12 +22,12 @@ describe("Normal distribution with sparklines", () => {
 
   let normalDistAtMean5: SymbolicDistTypes.normal = {mean: 5.0, stdev: 2.0}
   let normalDistAtMean10: SymbolicDistTypes.normal = {mean: 10.0, stdev: 2.0}
-  let range20Float = E.A.rangeFloat(0.0, 20.0) // [0.0,1.0,2.0,3.0,4.0,...19.0,]
+  let range20Float = E.A.Floats.range(0.0, 20.0, 20) // [0.0,1.0,2.0,3.0,4.0,...19.0,]
 
   let pdfNormalDistAtMean5 = x => Normal.pdf(x, normalDistAtMean5)
   let sparklineMean5 = pdfImage(pdfNormalDistAtMean5, range20Float)
-  makeTest("mean=5", Sparklines.create(sparklineMean5, ()), `▁▂▃▅███▅▃▂▁▁▁▁▁▁▁▁▁▁▁`)
+  makeTest("mean=5", Sparklines.create(sparklineMean5, ()), `▁▂▃▆██▇▅▂▁▁▁▁▁▁▁▁▁▁▁`)
 
   let sparklineMean15 = normalDistAtMean5 -> parameterWiseAdditionHelper(normalDistAtMean10) -> pdfImage(range20Float)
-  makeTest("parameter-wise addition of two normal distributions", Sparklines.create(sparklineMean15, ()), `▁▁▁▁▁▁▁▁▁▁▂▃▅▇███▇▅▃▂`)
+  makeTest("parameter-wise addition of two normal distributions", Sparklines.create(sparklineMean15, ()), `▁▁▁▁▁▁▁▁▁▂▃▄▆███▇▅▄▂`)
 })
diff --git a/packages/squiggle-lang/jest.config.js b/packages/squiggle-lang/jest.config.js
index 09bf05a8..a44cd302 100644
--- a/packages/squiggle-lang/jest.config.js
+++ b/packages/squiggle-lang/jest.config.js
@@ -2,6 +2,7 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
+  testPathIgnorePatterns: [".*Fixtures.bs.js", "/node_modules/", ".*Helpers.bs.js"],
   setupFilesAfterEnv: [
     "<rootdir>/../../node_modules/bisect_ppx/src/runtime/js/jest.bs.js"
   ],
diff --git a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res
index ab2dd63f..f3f8402a 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res
@@ -75,8 +75,10 @@ let toPointSet = (~xyPointLength, ~sampleCount, t): result<PointSetTypes.pointSe
   }
 }
 
-let toSparkline = (~xyPointLength: int, ~sampleCount: int, ~buckets: int = 20, t: t) : result<string, error> => 
-  toPointSet(~xyPointLength, ~sampleCount, t) -> E.R2.fmap(PointSetDist.toSparkline(buckets))
+let toSparkline = (~sampleCount: int, ~buckets: int = 20, t: t) : result<string, error> => 
+  toPointSet(~xyPointLength=buckets, ~sampleCount, t)
+    -> E.R.bind(x => x -> PointSetDist.T.toContinuous -> E.O2.toResult(GenericDist_Types.Other("Could not convert to continuous")))
+    -> E.R2.fmap(c => Sparklines.create(Continuous.getShape(c).ys, ()))
 
 module Truncate = {
   let trySymbolicSimplification = (leftCutoff, rightCutoff, t: t): option<t> =>
diff --git a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi
index dcb929ca..c37385e4 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi
+++ b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi
@@ -25,7 +25,6 @@ let toPointSet: (
   t,
 ) => result<PointSetTypes.pointSetDist, error>
 let toSparkline: (
-  ~xyPointLength: int,
   ~sampleCount: int,
   ~buckets: int=?,
   t,
diff --git a/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/PointSetDist.res b/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/PointSetDist.res
index e4e443fe..15186e0b 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/PointSetDist.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/PointSetDist.res
@@ -168,15 +168,6 @@ let pdf = (f: float, t: t) => {
 let inv = T.Integral.yToX
 let cdf = T.Integral.xToY
 
-
-@genType
-let toSparkline = (buckets: int, t: t ): string => {
-  let size : float = T.maxX(t) -. T.minX(t)
-  let stepSize = size /. Belt.Int.toFloat(buckets)
-  let cdfImage = E.A.rangeFloat(~step=stepSize, T.minX(t), T.maxX(t)) -> Belt.Array.map(val => cdf(val,t))
-  Sparklines.create(E.A.diff(cdfImage), ())
-}
-
 let doN = (n, fn) => {
   let items = Belt.Array.make(n, 0.0)
   for x in 0 to n - 1 {
@@ -200,7 +191,6 @@ let isFloat = (t: t) =>
 let sampleNRendered = (n, dist) => {
   let integralCache = T.Integral.get(dist)
   let distWithUpdatedIntegralCache = T.updateIntegralCache(Some(integralCache), dist)
-
   doN(n, () => sample(distWithUpdatedIntegralCache))
 }
 
diff --git a/packages/squiggle-lang/src/rescript/Utility/E.res b/packages/squiggle-lang/src/rescript/Utility/E.res
index 30b48881..0411bf3c 100644
--- a/packages/squiggle-lang/src/rescript/Utility/E.res
+++ b/packages/squiggle-lang/src/rescript/Utility/E.res
@@ -101,6 +101,7 @@ module O2 = {
   let default = (a, b) => O.default(b, a)
   let toExn = (a, b) => O.toExn(b, a)
   let fmap = (a, b) => O.fmap(b, a)
+  let toResult = (a, b) => O.toResult(b, a)
 }
 
 /* Functions */
@@ -178,6 +179,7 @@ module R = {
 
 module R2 = {
   let fmap = (a,b) => R.fmap(b,a)
+  let bind = (a, b) => R.bind(b, a) 
 }
 
 let safe_fn_of_string = (fn, s: string): option<'a> =>
@@ -290,13 +292,6 @@ module A = {
       |> Rationale.Result.return
     }
 
-  let diff = (arr: array<float>): array<float> =>
-    Belt.Array.zipBy(arr, Belt.Array.sliceToEnd(arr, 1), (left, right) => right -. left)
-
-  let rec rangeFloat = (~step: float=1.0, start : float, end: float) : array<float> => 
-    start > end ?
-      []
-      : Belt.Array.concat([start], rangeFloat(~step, start +. step, end))
 
   // This zips while taking the longest elements of each array.
   let zipMaxLength = (array1, array2) => {
@@ -448,6 +443,10 @@ module A = {
     let mean = a => sum(a) /. (Array.length(a) |> float_of_int)
     let random = Js.Math.random_int
 
+    let diff = (arr: array<float>): array<float> =>
+      Belt.Array.zipBy(arr, Belt.Array.sliceToEnd(arr, 1), (left, right) => right -. left)
+
+
     exception RangeError(string)
     let range = (min: float, max: float, n: int): array<float> =>
       switch n {